Remove ServerTrustManager

The implementation of ServerTrustManger contains a security
vulnerability, which could lead to unauthorized certificates being
erroneously trusted. SMACK-410
Remove RCS header attributes
Add namespace attribute to XHTML-IM body tags

Fixes SMACK-531
Fix typo in StreamInitiation.setSesssionID()

Fixes SMACK-427
Add test-reports/ to gitignore
Remove <invalid-id> stream error (SMACK-401)

RFC 6120 removed the unnecessary and unused <invalid-id/> stream error.
Change xml-not-well-formed to not-well-formed

Fixes SMACK-400